Formaldehyde-fumigator.



No. 747,184. PATENTED DEC. 15, 1903.

R. W. JOHNSON. FORMALDEHYDE FUMIGATOR.

APPLICATION FILED MAR. 18. 1902.

N0 MODEL.

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Ururn IPatented IJeceinber 15, 1903.

ROBERT W. JOHNSON, OF NEW BRUNSWICK, NEW JERSEY.

FORMALDEHYDE FUMIGATOR.

SPECIFICATION forming part of Letters Patent No. 747,184, dated December 15, 1903.

Application filed March 18, 1902. Serial No. 98,811. (No model.)

To all whom it may concern.-

Be it known that 1, ROBERT W. JOHNSON, a citizen of the United States, residing at New Brunswick, in the county of Middlesex and State of New Jersey, have invented certain new and useful Improvements in Fumigators and Air-Sterilizers, of which the following is a specification, reference being bad therein to the accompanying drawings.

My invention relates to compounds of devices and substances to facilitate the transformation of paraform and naphthalene by heat into gases and vapors and their dispersion into the air of a room to destroy germs which may be therein; and the objects of my invention are to provide simple and inexpensive mixtures added to paraform alone or to paraform and naphthalene which can be lighted and burn without flame and a receiver or jacket capable of burning also without flame, the whole surrounding a non-burning receiver adapted to contain a liquid which can be vaporized by the heat produced by said burning mixtures. I attain these objects by the mixture hereinafter described in connection with the construction and the material of the receiver or jacket illustrated in the accompanying drawings, in which Figure 1 is a perspective view of the fumigator with the sealed cover partly broken away to show the inner liquid-receiver and the fumigating mixture packed tightly around it. Fig. 2 is a vertical central section of the same. In said drawings the numeral 2 represents a quadrangular prismatic box or receiver fully twice as high as it is wide, but which may be of other proportions, and it can be made cylindrical, if desired. Said receiver is made of paper or of light pasteboard or of cloth which has been impregnated or coated with a preparation of nitrate of lead or nitrate of soda or other nitrates of a metal or of an alkali and dried, so that when the paper is lighted it will hold the fire without a blaze. The bottom of the box is closed with a slightly larger sheet 3, either of the same to stand on a plate or a saucer or some other suitable fireproof base.

Vi ithin the center of the box 2 is placed a cylindrical inner receiver 4, of glass or of metal, so asv to stand the vaporization of water or of liquid formalehyde, which may be placed therein. The space between the walls of the box 2 and the inner receiver 4 is packed with a mixture 5, adapted to burn without flame. Said mixture consists of paraform and naphthol or naphthalene with carbonaceous materialssuch, for instance, as powdered bark, powdered wood, or paper-pulp, or also pyrethrum insect-powder in the proportions of paraform two parts, naphthol one part, and carbonaceous vegetable matter one part. Said materials will ignite from the paper jacket or box 2 and burn without flame, but will cause sufficient heat to vaporize the paraform. If the fumigator is of very small diameter, the carbonaceous material may be dispensed with.

After the box has been filled it is closed with a cover 6, preferably of paper, the edges of which overlap the top of the box and are glued or cemented to the sides of said box.

When it is desired to use the fumigator, it is placed upon a saucer or other suitable support, and the cover being partly removed the box is lighted near its top or along one of its edges; but after it is lighted care is taken that the flame is blown off, if there is any flame, and the fumigator allowed to burn to the bottom, the heat produced being sufficient to vaporize the liquid in the inner receiver 4, the moisture combining with the fumes of the paraform and naphthol increase their effect to sterilize the air.

Having now fully described my invention, I claim 1. A fumigator consisting of a mixture of paraform and naphthalene,and carbonaceous material, a fireproof receiver capable of containing a liquid, within said mixture and an outer jacket of paper impregnated with some nitrate, and a cover for said jacket, sealing in the mixture of the fumigator substantially as described.

2. A fumigator consisting of a mixture of paraform and carbonaceous material, and an outer jacket of paper impregnated with some nitrate and a cover for said jacket, sealing in the mixture of the fumigator, substantially said jacket sealing in the mixture of the fn- 1o migator substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

ROBERT W. JOHNSON.

Witnesses:

R. C. KENYON, J. L. CARBERRY. 

